Clean before release v0.3.0

src/app/Installer.java

src/app/OrekitInit.java

src/cs/si/satatt/AboutActivity.java

src/cs/si/satatt/MainActivity.java

src/database/SerializationUtil.java

src/dialogs/DeleteMissionDialogFragment.java

src/dialogs/ResetAppDialogFragment.java

src/dialogs/ResetDbDialogFragment.java

src/fragments/HudFragment.java

src/fragments/NavigationDrawerFragment.java

src/fragments/SimulatorFragment.java

src/fragments/TestFragment.java

src/mission/Mission.java

src/mission/Orbit.java

src/model/ModelSimulation.java

src/simulator/Simulator.java

src/simulator/SimulatorThread.java

src/web/WebAppInterface.java